Days Living in a Different World

First of all, how does the protagonist, who is a time traveler, feel that he is being targeted? Especially after traveling through many years. I even forgot the tools! And ruthless and foolhardy! Now, everyone knows the importance of money, but they can't even open the pot at home! The salted fish here is so good that it can be like this,

I feel that the protagonist written by the author is brave and ambitious. Faced with reality, one can only be helpless and furious. And he has high ambitions but low intentions.

In ancient times, it was easy to make money as long as you were good at literacy or mathematics. Whether it was helping with accounting or being a housekeeper, there were always people in demand. And since you are a time traveler, of course you have to build a steam engine. Early steam engines were very simple. They just boiled water and used a fan to drive the gears. There was also papermaking and letterpress printing. Although the world has its own origins, the scarcity of knowledge written in it means that the world in the book does not have these technologies. There is also gunpowder. Although modern firearms cannot be made, matchlocks from hundreds of years ago are still easy to make. The crossbow can also allow a new soldier to directly threaten the elite cavalry who have been trained for decades. This technology can also make a lot of money. There is also standardization. I think back when there was no standardization in China, even the aircraft coming off the same production line were not interchangeable. Basically, nine out of ten in the sky had to be adjusted by various supporting talents and technologies from the United States. In ancient times, for example, a sword or a nail required a mid-to-high-end blacksmith, but if it is standardized and scaled up, even a novice who has just learned can complete more than half of the work, and the efficiency can be increased at least several times. This frees up high-end talents, who can work with steam engines to accelerate industrial development.

Author, what happened to the last book? Why is it gone?